/Engine/Source/Editor/SequencerCore/Public/MVVM/Extensions/IOutlinerExtension.h
Toggles a bit in the outliner item's selection state
virtual void ToggleSelectionState ( [EOutlinerSelectionState](API\Editor\SequencerCore\MVVM\Extensions\UE__Sequencer__EOutlinerSelectio-) InState, bool bInValue )